The researchers are planning a study of independent cases and controls with 1 control(s) per case. Kotb et al found that the ongoing pregnancy rate in women undergoing IVF/ICSI who received DHEA with expected POR according to the Bologna criteria is 0.285 versus 0.128 in the control group. Assuming that adding GH to DHEA will not increase the ongoing pregnancy rate, the researchers will need to study 103 case patients and 103 control patients to be able to reject the null hypothesis that the exposure rates for case and controls are equal with probability (power) 0.8. The researchers added 12 patients to each arm accounting for any missing data or losses to follow up. The Type I error probability associated with this test of this null hypothesis is 0.05. The researchers used an uncorrected chi-squared statistic to evaluate this null hypothesis.